grab sample


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grab sample

[′grab ‚sam·pəl]
(mining engineering)
A random mode of sampling; the samples may be taken from the pile broken in the process of mining, or from a truck or car of ore or coal.
References in periodicals archive ?
Flow-proportional, time-composited, and grab sample estimation of nitrogen export from an eastern coastal plain watershed.
The species-accumulation curves for substrate classes and depth zones derived from the macrofauna grab sample data for both locations did not stabilize toward an asymptotic value for observed data (Fig.
siliqua were followed over a three-year period on Banquereau (Eastern Canada) based on grab samples (Gilkinson et al.
In 2000, the second author analyzed the results of 584 grab samples that had been taken in 1999 from 580 ATUs by the Monroe County Health Department (MCHD).
A number of other prospects on the Rex-Duquet Property, several of them kilometre-scale, have also yielded grab samples with significant grades for gold (up to 580 g/t Au), silver (up to 552.9 g/t Ag), copper (up to 4.4% Cu), tungsten (up to 0.87% W), molybdenum (up to 0.57% Mo) and rhenium (up to 1.44 g/t Re) (press releases of October 12, 2010 and February 9, 2012).
Channel samples are considered representative of the in-situ mineralization samples and sample widths quoted approximate the true width of mineralization, while grab samples are selective by nature and are unlikely to represent average grades on the property.
Grab samples are no more than indicators of probable performance at a particular moment.
The reader is cautioned that grab sample assays represent prospecting samples and may not be representative of the grade or width of the mineralization.
The Bankfield which is located approximately 7 km to the East of the Rockstar vein, returned initial channel and grab samples up to 39.8 g/t Au (grades ranged from detection levels to 39.8 g/t).
The potential of the prospect is for: (a) high grade, narrow vein gold as shown by the grab sample assays; and (b) a more broad spread dissemination of lower grade gold in the veins and vein margins that may form an open-pittable bulk mining operation, as evidenced by the widespread gold reported in creek samples and drainages from the tenement.
The AnaTOC TOC analyzer has four grab sample ports or can accommodate a 64-vial autosampler.